An advocacy group says some bilingual classes are little towers of Babel – with children who speak a jumble of foreign languages mixed in together.

More than one-third of bilingual-education teachers have students who speak a different native language – making it more difficult for the kids to learn English, a survey found.

“These children aren’t going to succeed,” said Jill Chaifetz, executive director of Advocates for Children, the group that conducted the survey of 227 bilingual teachers along with the New York Immigration Coalition.

For example, a student who speaks Haitian-Creole may be thrown into a bilingual class with a Spanish-speaking teacher. Or a Russian immigrant child may be enrolled in a class in which the teacher and most of the students speak Chinese.

Chaifetz said it’s “disturbing” that so many kids are placed in the wrong bilingual classes, and that worsens their chances of picking up English and meeting tougher state standards, which include passing five Regents exams to earn a high-school diploma.

“A child who is not being taught in her native language is not in a bilingual program,” Chaifetz said.

The advocates complained that a shortage of foreign-language and bilingual teachers is what’s leaving students in the lurch.

They recommended that the city pay bilingual-education teachers more than other instructors – a recommendation the United Federation of Teachers has resisted.

The report also said students in jeopardy of getting left back aren’t provided additional services to help them improve.

The advocates recommended the city pump an additional $200 million to improve and expand programs for students who speak foreign languages.